You must use,’ said the gentleman, ’for all these purposes, combinations and modifications (in primary colours) of mathematical figures which are susceptible of proof and demonstration.
Nor could any such spectator fail to know in his own breast, that these men, through their very delusions, showed great qualities, susceptible of being turned to the happiest and best account; and that to pretend (on the strength of sweeping axioms, howsoever cut and dried) that they went astray wholly without cause, and of their own irrational wills, was to pretend that there could be smoke without fire, death without birth, harvest without seed, anything or everything produced fromů
There are no more uses of "susceptible" in the book.
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susceptible to colds
Not being susceptible to contradicting evidence, it is not a testable hypothesis.